To get some idea of what Poole sounds like, first listen to a couple of those old Dion albums your mother has stashed away in the attic. Add a little of Husker Du's guitar grinding melodicism, and add a dash of vocal harmony stolen straight from the Beatles, and you might get the general idea.
These are photos from concerts where Poole played, so they may be of other bands that played the concert as well.
HFStival 1997 May 31, 1997 Washington, D.C., United States Uploaded by Ahawk9